JPH11136007A - Nonreversible circuit element and circuit board including it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a nonreversible circuit element such as an isolator and a circulator short. SOLUTION: 1st and 2nd holes 36 and 37 which are arranged side by side when viewing flatly are provided on a holder 27. A 1st ferrite block 25a is arranged at the hole 36 and a magnet 26 is arranged at the hole 37. Central conductors 21 to 23 are arranged on the block 25a and a 2nd ferrite block 25b is further arranged on it. 1st and 2nd magnetic circuit forming bodies 29 and 30 which are constituted of steel plates to connect the magnet 26 to the 1st and 2nd blocks 25a and 25b are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to VHF, UHF,
The present invention relates to a nonreciprocal circuit element such as a circulator and an isolator used in a transmission circuit of a radio frequency band such as SHF and a circuit board device including the same.

[0002]

2. Description of the Related Art A lumped-constant circulator using ferrite, which is schematically shown in FIG. 1, is known as a circulator used for communication equipment such as a portable telephone. FIG.
Is a Y-type circulator, and 12
First, arranged at 0 degree intervals and connected to each other in a Y-shape;
A second and third central conductors 1, 2, 3; a disc-shaped ferrite 4 as a magnetic material arranged so as to be surrounded by these central conductors 1, 2, 3; It has a disk-shaped permanent magnet 5 for providing, a multilayer substrate 6 for obtaining matching capacitors and terminals, a lower case 7 and an upper case 8. A through hole 9 is formed in the multilayer substrate 6, and an assembly of the center conductors 1, 2, 3 and the ferrite 4 is arranged in the through hole 9. The substrate 6 is obtained by providing a conductor layer on a dielectric layer 10, and has first, second, and third capacitor and connection conductor layers 11, 12, and 13 on the surface thereof. The first, second and third capacitor and connection conductor layers 1
The first, second and third central conductors 1, 12 and 13 have
A few are connected by solder. A ground conductor layer is provided inside the substrate 6, and the first, second, and third capacitance and connection conductor layers 11, 12, and 13 are opposed to the ground conductor layer. A matching capacitance can be obtained between the second and third capacitors and the connecting conductor layers 11, 12, and 13 and the ground.

The ground conductor layer of the substrate 6 and the ferrite 4
The interconnecting portions of the first, second and third central conductors 1, 2, and 3 arranged on the lower surface of the metal are fixed to the lower metal case 7 by soldering, and the permanent magnet 5 is connected to the upper metal case. 8 is fixed to the lower surface. The upper case 8 is provided with a first pair of bent portions 14 and 15 and a second pair of bent portions 16 and 17. The first pair of bent portions 14 and 15 are formed so as to cover both ends of the pair of bent portions 18 and 19 of the lower case 7, and the second pair of bent portions 16 and 17 are formed of the pair of lower case 7. It is soldered to the bent portions 18 and 19.
When one of the terminals of the circulator of FIG. 1 is terminated, it becomes an isolator.

[0004]

In a non-reciprocal circuit device such as a circulator and an isolator, a ferrite 4 and a magnet 5 are coaxially arranged as shown in FIG. Therefore, it has been difficult to reduce the height of the nonreciprocal circuit element and the circuit board device including the same.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a nonreciprocal circuit element which can be reduced in height and a circuit board device including the same.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and to achieve the above-mentioned object, the present invention provides a plurality of central conductors arranged so as to have mutually intersecting portions and insulated from each other at the intersecting portions. A ferromagnetic body opposed to the center conductor, a magnet for applying a magnetic field to the ferromagnetic body, and a magnetic circuit forming body, and a center line extending in a thickness direction of the ferromagnetic body and the magnet The ferromagnetic material and the magnet are arranged so that a center line extending in the thickness direction of the ferromagnetic material is parallel to each other and does not overlap with each other when viewed in a plan view. The present invention relates to a non-reciprocal circuit device which is arranged so as to be guided to a body. It is to be noted that a holder is provided as described in claim 2, a first hole and a second hole are provided in the holder, which are juxtaposed with each other in plan view, and the first hole is a ferromagnetic material, and the second hole is Can be arranged. Further, the first and second holes may be provided in the circuit board, and a ferromagnetic material may be provided in the first hole and a magnet may be provided in the second hole.

[0007]

According to the present invention, since the ferromagnetic material and the magnet for applying a magnetic field thereto are arranged so as not to overlap in a plan view, the height of the nonreciprocal circuit device can be reduced. Can be. According to the second aspect of the present invention, since the holder is used, the positioning of the ferromagnetic material and the magnet and the assembly of the non-reciprocal circuit device are facilitated. According to the third aspect of the present invention, since the non-reciprocal circuit device is configured using the circuit board, the cost can be reduced.

[0008]

Embodiments and Examples Next, embodiments and examples of the present invention will be described with reference to the drawings.

[0009]

First Embodiment First, a lumped-constant isolator according to a first embodiment will be described with reference to FIGS. The isolator of this embodiment is used for a mobile telephone device or the like, and includes a laminate 24 including center conductors 21, 22, and 23,
Disc-shaped first and second ferrite blocks 25a, 25b made of IG (Yttrium Iron Garnet), that is, garnet-based ferrite, and columnar permanent magnets for applying a magnetic field to the first and second ferrite blocks 25a, 25b. 26, first and second holders 27 and 28, first and second magnetic circuit forming bodies 29 and 30, first, second and third capacitors 31, 32 and 33, and terminator 34. Consisting of

The laminated body 24 is a plate having a rectangular shape in a plane shape, and the first, second and third central conductors 2 are provided in an insulating layer 35.
1, 22 and 23 are buried so as to have a portion crossing each other. First, second and third center conductors 2
1, 22, and 23 are arranged at intervals of 120 degrees, are connected in a Y-shape as shown in the equivalent circuit of FIG. 4, and an interconnection point at one end thereof is connected to the ground. The laminate 24
The surface of the insulating layer 35, that is, the first and second surfaces shown in FIG.
And conductor layers corresponding to the third terminals P1, P2, P3 are provided, but these are not shown in FIG. First, second and third fixed to the main surface of the laminate 24
The capacitors 31, 32, and 33 are matching capacitors and are connected between the terminals P1, P2, and P3 and the ground conductor layer as shown in FIG. The terminating resistor 34
Is connected between the terminal P3 and the ground conductor layer.

The first holder 27 is a molded body made of a synthetic resin, and includes first and second holes 36,
37, and the first and second magnetic circuit forming bodies 29,
It has 30 positioning edges 38,39. As shown in FIG. 3, a first ferrite block 25a having a disk shape is arranged in the first hole 36, and a columnar magnet 26 is accommodated in the second hole 37. Since the magnet 26 is formed thicker than the first and second ferrite blocks 25a and 25b, the second hole 37 of the first holder 27 is formed thicker than the first hole 36. I have. The first holder 27 has a space on the first hole 36 for accommodating the stacked body 24 and the second holder 28, and as shown in FIG. 3, the stacked body 24 and the second holder 28 Are arranged in a laminated state with respect to the ferrite block 25a. A plurality of terminal conductor layers 40 are provided on the outer peripheral surface of the first holder 27, and are connected to terminal conductors (not shown) of the multilayer body 24. The first holder 27 has a terminal conductor layer 40.
Are only shown.

The outer circumference of the second holder 28 is
And a hole 41 extending from one main surface to the other main surface, and the other main surface (lower surface) having the first, second, and third holes. It has four recesses for accommodating the third capacitors 31, 32, 33 and the terminating resistor. As shown in FIG. 3, the second holder 28 is disposed on the center conductor laminate 24,
The hole 41 accommodates the second ferrite block 25b, and the recess 42 accommodates the capacitors 31, 32, 33 and the terminating resistor.

First and second magnetic circuit forming bodies 29, 30
Is, for example, an iron plate made of a soft magnetic material, the upper surface of the magnet 26, the upper surface of the second ferrite block 25b, and the magnet 2
6 and the lower surface of the first ferrite block 25a are magnetically coupled. In addition, the first and second
The magnetic circuit forming bodies 29 and 30 are housed inside the frame-shaped edges 38 and 39 of the first holder 27 and are fixed to the first holder 27 with an adhesive.

In the isolator of this embodiment, in the equivalent circuit of FIG. 4, transmission of a signal incident on the terminal P1 to the terminal P2 is permitted, but transmission of a signal incident on the terminal P2 to the terminal P1 is prevented. Operate. Therefore, the reflected wave generated by the load connected to the terminal 2 is prevented from returning to the terminal P1.

In the isolator of this embodiment, FIG.
As is clear from FIG. 2, the first and second ferrite blocks 25a and 25b are arranged so that the center axis 43 indicated by a broken line and the center axis 44 indicated by a broken line of the magnet 26 are parallel to each other, and viewed in plan. Since both are arranged so as not to overlap with each other, the thickness of the isolator in the direction in which the center lines 43 and 44 extend can be reduced, that is, the isolator can be reduced in thickness or height. Even if the ferrite blocks 25a, 25b and the magnet 26 are arranged on different axes, the magnetic closed circuit is formed by the first and second magnetic circuit forming bodies 29, 30, so that the ferrite blocks 25a, 25b, 25b
Can be applied with a magnetic field. Also, the first holder 27
The first and second holes 36 and 37 are provided from the one main surface to the other main surface, and the first ferrite block 25a and the magnet 26 are arranged in the first and second holes. In addition, assembly of the isolator becomes easy. Further, the first holder 27 is provided with frame-shaped edges 38 and 39, in which plate-shaped first and second magnetic circuit forming bodies 2 are provided.
Since the positions 9 and 30 are arranged, these positionings can be easily achieved. In addition, a concave portion 42 is provided in the second holder 28 that houses the second ferrite block 25b,
Since the capacitors 31, 32, 33 and the resistor 34 are accommodated, the capacitors 31, 32, 33 and the resistor 34 do not prevent the height from being reduced.

[0016]

Second Embodiment Next, a lumped-constant isolator according to a second embodiment will be described with reference to FIGS. However, in FIGS. 5 and 6, substantially the same parts as those in FIGS. 1 to 4 are denoted by the same reference numerals, and description thereof will be omitted. The isolator of the second embodiment is integrally formed as a part of the circuit board device. That is, a part of the insulating circuit board 27a made of a ceramic plate or the like is used as a holder of the isolator, and first and second holes 36a and 37a extending from one main surface of the substrate 27a to the other main surface are formed. First hole 3
The ferrite block 25a is accommodated in 6a, and a part of the magnet 26 is accommodated in the second hole 37a. 1st, 2nd
The capacitor 3 shown in FIG. 2 is provided on the surface of the laminate 24 including the third central conductors 21, 22, 23 and the insulating layer 35.
4, are disposed on the surface of the substrate 27a as shown in FIG. 6, and the center conductor 21, the wiring conductor (not shown) as in FIG.
22 and 23 are connected. An electronic component 51 for forming a high-frequency circuit is mounted on the substrate 27a. In the isolator of the second embodiment, the one corresponding to the second ferrite block 25b of the first embodiment is omitted, and the upper surface of the laminate 24 is provided with a first ferrite block through a spacer 52 through which a magnetic flux can pass. Of the magnetic circuit forming bodies 29 are opposed to each other. In FIG. 5, the first and second magnetic circuit forming bodies 29 and 30 are arranged so that a magnetic closed circuit including the ferrite block 25a and the magnet 26 can be formed similarly to the first embodiment. Ferrite block 25
a, the magnet 26 is attached to the substrate 27a by an adhesive (not shown).
The laminated body 24, the first and second magnetic circuit forming bodies 29 and 30, and the spacer 52 are fixed to members adjacent thereto by an adhesive. In addition, the first and second magnetic circuit forming bodies 29 and 30 and a portion between them can be integrated by resin molding.

Also in the second embodiment, YI as viewed in plan
Since the ferrite block 25a made of G and the magnet 26 are juxtaposed so as not to overlap, the height of the isolator can be reduced. Also, holes 36a, 3a are formed in the circuit board 27a.
Since the ferrite block 25a and the magnet 26 are arranged by providing the ferrite block 7a, the thickness of the circuit board device, that is, the height can be reduced. Further, since the circuit board 27a is also used as a holding portion for the components of the isolator, the cost can be reduced.

[0018]

[Modifications] The present invention is not limited to the above-described embodiment, and for example, the following modifications are possible. (1) The center conductor 21 in the first and second embodiments,
Instead of 22, 23, ferrite blocks 25a, 25b, capacitors 31, 32, 33, the center conductor 1, FIG.
7 shown in FIG. 7 in which 2, 3, the ferrite 4 and the multilayer substrate 6 are integrated. (2) The capacitors 31, 32, and 33 of FIG.
5 can be a multilayer capacitor embedded. (3) The terminating resistor 34 can be omitted to form a circulator. (4) As shown in FIG. 8, each of the center conductors 21, 22, and 23 can be formed to have two conductors that are parallel to each other and connected in parallel. In FIG. 8, the intersections of the center conductors 21, 22, and 23 are insulated from each other. In addition, at least six layers are provided when forming a laminate structure. (5) YI as ferrite blocks 25a and 25b
Garnet ferrites other than G or spinel ferrites can be used.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view schematically showing a conventional circulator.

FIG. 2 is an exploded perspective view schematically showing the isolator of the first embodiment.

FIG. 3 is a central longitudinal sectional view of the isolator of the first embodiment.

FIG. 4 is an equivalent circuit diagram of the isolator of the first embodiment.

FIG. 5 is an enlarged sectional view showing a portion corresponding to a line AA in FIG. 6 of the isolator of the second embodiment.

6 is a plan view of the isolator of FIG.

FIG. 7 is a perspective view showing a part of an isolator according to a modification.

FIG. 8 is a perspective view showing a modification of the center conductor.

[Explanation of symbols]

 21, 22, 23 Center conductor 25a, 25b Ferrite block 26 Magnet 27 Holder 29, 30 Magnetic circuit forming body

Claims (3)

[Claims] 1. A plurality of central conductors arranged so as to have portions that intersect each other and insulated from each other at the intersecting portions, a ferromagnetic material disposed to face the central conductor, and a magnetic field applied to the ferromagnetic material. And a magnetic circuit forming body, wherein a center line extending in the thickness direction of the ferromagnetic material and a center line extending in the thickness direction of the magnet are parallel to each other and do not overlap each other when viewed in a plan view. The ferromagnetic body and the magnet are arranged as described above, and the magnetic circuit forming body is arranged to guide a magnetic flux generated from the magnet to the ferromagnetic body. 2. A plurality of central conductors arranged so as to have portions that intersect each other and insulated from each other at the intersecting portions, a ferromagnetic material disposed to face the central conductor, and a magnetic field applied to the ferromagnetic material. A non-magnetic holder accommodating the center conductor, the ferromagnetic material, and the magnet; and a magnetic circuit forming body, First and second holes are provided; the ferromagnetic material is disposed in the first hole; the magnet is disposed in the second hole; and the center conductor is disposed so as to overlap the ferromagnetic material. The non-reciprocal circuit device, wherein the magnetic circuit forming body is arranged to guide a magnetic flux generated from the magnet to the ferromagnetic material. 3. A circuit board on which a circuit component is mounted, a plurality of central conductors arranged so as to have an intersecting portion and insulated from each other at the intersecting portion, and a strong member arranged opposite to the central conductor. A magnetic body, a magnet for applying a magnetic field to the ferromagnetic body, and a magnetic circuit forming body, wherein the circuit board has first and second holes formed in a plan view, and the first hole A magnet is disposed in the second hole, the center conductor is disposed so as to overlap the ferromagnetic material, and the magnetic circuit forming body generates a magnetic flux generated from the magnet. A circuit board device which is arranged so as to be guided to a ferromagnetic material.